Thingspeak：用Python解析json响应

我想创建一个Alexa技能，使用Python使用传感器上传到Thingspeak的数据。我只使用一个特定值的情况非常简单，Thingspeak的响应是唯一的值。当我想使用几个值时，在我的例子中，为了总结大气压力来确定趋势，响应是一个json对象，如下所示：

{"channel":{"id":293367,"name":"Weather Station","description":"My first attempt to build a weather station based on an ESP8266 and some common sensors.","latitude":"51.473509","longitude":"7.355569","field1":"humidity","field2":"pressure","field3":"lux","field4":"rssi","field5":"temp","field6":"uv","field7":"voltage","field8":"radiation","created_at":"2017-06-25T07:35:37Z","updated_at":"2018-08-04T12:11:22Z","elevation":"121","last_entry_id":1812},"feeds":
[{"created_at":"2018-10-21T18:11:45Z","entry_id":1713,"field2":"1025.62"}, 
 {"created_at":"2018-10-21T18:12:05Z","entry_id":1714,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:12:25Z","entry_id":1715,"field2":"1025.56"}, 
 {"created_at":"2018-10-21T18:12:45Z","entry_id":1716,"field2":"1025.65"}, 
 {"created_at":"2018-10-21T18:13:05Z","entry_id":1717,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:13:25Z","entry_id":1718,"field2":"1025.63"}]

我现在从

f = urllib.urlopen(link) # Get your data
json_object = json.load(f)

for entry in json_object[0]
  print entry["field2"]

json对象是一个有点递归的对象，它是一个列表，包含一个列表，其中一个元素的值是数组。 现在我不太确定如何迭代数组中键“field2”的值。我对Python和json都很陌生。也许有人能帮我

---

提前谢谢

你有一本字典。使用键访问该值

Ex:

json_object = {"channel":{"id":293367,"name":"Weather Station","description":"My first attempt to build a weather station based on an ESP8266 and some common sensors.","latitude":"51.473509","longitude":"7.355569","field1":"humidity","field2":"pressure","field3":"lux","field4":"rssi","field5":"temp","field6":"uv","field7":"voltage","field8":"radiation","created_at":"2017-06-25T07:35:37Z","updated_at":"2018-08-04T12:11:22Z","elevation":"121","last_entry_id":1812},"feeds":
[{"created_at":"2018-10-21T18:11:45Z","entry_id":1713,"field2":"1025.62"}, 
 {"created_at":"2018-10-21T18:12:05Z","entry_id":1714,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:12:25Z","entry_id":1715,"field2":"1025.56"}, 
 {"created_at":"2018-10-21T18:12:45Z","entry_id":1716,"field2":"1025.65"}, 
 {"created_at":"2018-10-21T18:13:05Z","entry_id":1717,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:13:25Z","entry_id":1718,"field2":"1025.63"}]}

for entry in json_object["feeds"]:
    print entry["field2"]

1025.62
1025.58
1025.56
1025.65
1025.58
1025.63

输出：

json_object = {"channel":{"id":293367,"name":"Weather Station","description":"My first attempt to build a weather station based on an ESP8266 and some common sensors.","latitude":"51.473509","longitude":"7.355569","field1":"humidity","field2":"pressure","field3":"lux","field4":"rssi","field5":"temp","field6":"uv","field7":"voltage","field8":"radiation","created_at":"2017-06-25T07:35:37Z","updated_at":"2018-08-04T12:11:22Z","elevation":"121","last_entry_id":1812},"feeds":
[{"created_at":"2018-10-21T18:11:45Z","entry_id":1713,"field2":"1025.62"}, 
 {"created_at":"2018-10-21T18:12:05Z","entry_id":1714,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:12:25Z","entry_id":1715,"field2":"1025.56"}, 
 {"created_at":"2018-10-21T18:12:45Z","entry_id":1716,"field2":"1025.65"}, 
 {"created_at":"2018-10-21T18:13:05Z","entry_id":1717,"field2":"1025.58"}, 
 {"created_at":"2018-10-21T18:13:25Z","entry_id":1718,"field2":"1025.63"}]}

for entry in json_object["feeds"]:
    print entry["field2"]

1025.62
1025.58
1025.56
1025.65
1025.58
1025.63

---

这与json无关-一旦json字符串被

json.load（）

解析，您将得到一个普通的python对象（通常是dict，有时是list，很少-但这是合法的-字符串、int、float、boolean或

None

）

它是一个列表，包含一个列表，列表中的元素的值为数组

实际上，它是一个带有两个键的

dict

“频道”和

“提要”

。第一个有另一个dict表示值，第二个是

dict

s的

list

。FWIW广泛记录了如何使用dicts和list

在这里，您要查找的值存储在dicts的“feeds”键中的“field2”键下，因此您需要：

# get the list stored under the "feeds" key
feeds = json_object["feeds"]

# iterate over the list:
for feed in feeds:
    # get the value for the "field2" key
    print feed["field2"]

---

我刚想出来，就像预料的那样。 您必须从dict中获取

条目

数组，然后迭代项目列表并将值打印到键

字段2

# Get entries from the response
entries = json_object["feeds"]

# Iterate through each measurement and print value
for entry in entries:
  print entry['field2']

---

谢谢你的解释，我只是自己想出来的。这就是它的工作原理。：-）谢谢你的回答，这和预期的一样。